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| Bike Race |
| A solar bike is being tuned for a race. |
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| Earth from the Galileo Space Probe |
| This image of Earth was taken by the Galileo space probe on December 11, 1990, when Galileo was 2 million kilometers (1.3 million miles) from Earth. |
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| Flat-Plate Collector |
| A flat-plate collector provides hot water for the U.S. Environmental Protection Agency, in Washington, DC. |
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| Georgetown Center |
| Photovoltaic panels provide electricity for the Intercultural Center at Georgetown University in Washington, DC. |
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| Moon from Apollo 11 |
| This photograph of the Moon was taken by the Apollo 11 astronauts as they traveled toward their famous rendezvous with the lunar surface. |
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| Moon Orbiting the Earth |
| This image was captured by the Galileo spacecraft in 1992 as it flew by Earth at a distance of 6.2 million km (3.9 million miles). |
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| Plane Shadow |
| A plane and its shadow approach Denver airport. Which will hit the runway first? |
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| Solar Household |
| This house with sloped glass is an example of passive solar energy use. |
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| Solar System |
| Earth is one of the nine planets that revolve around the Sun in our solar system. |
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| The Sun from Space |
| An image of the Sun from the SOHO Extreme Ultraviolet Imaging Telescope. |
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| Sunracer |
| This photovoltaic-powered vehicle, from the University of Michigan, won the Sunrayce in 1993. |
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| Tracing Shadows |
| A student at Harding School in El Cerrito, California, traces his partner's shadow. |
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| Water Monitor |
| Photovoltaics power a water-level monitoring station on the Laramie River in central Wyoming. |
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| Wind Farm |
| The wind turbines on this wind farm provide inexpensive electricity. |
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